Better meals and less harassment are perks for females who take on more flashy, masculine coloring.
. “But that doesn’t tell the whole story here. If we want to look at ornamentation in White-necked Jacobins as a whole, including females and males, we have to use social selection.”
To determine this, Falk’s study was conducted in three parts. During the first phase, the evolutionary biologists captured over 400 hummingbirds over the course of five years, took note of their physical characteristics and drew a bit of blood for genetic identification. They found that not only do all males and some females display the brilliant blue hues, but so do all young hummingbirds regardless of gender.
“Basically, we found that when there was a non-ornamented female present, the males had a very strong preference in terms of mating behavior with those mounts,” says Falk. This was a very strong indication that sexual selection was not responsible for some of the hovering females’ unique coloring.
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